Method of manufacturing artificial cork.



UNITED STATES PATENT OFFICE.

METHOD or MANUFACTURING ARTIFICIAL coax.

Specification of Letters Patent.

Patented June 15, 1909.

Application filed. February 25, 1908. Serial No. 417,755.

To all whom it may concern;-

Be it known that I, BRONISLAUS Honowsing, a subject of theRussian Emperor, and

resident of St. Petersburg, Russia, have invented certain new and useful Improvements in Methods of Manufacturing Artificial Cork, of which the following is a specification.

This invention relates to'a method of manufacturing artificial cork from cork chips or Waste, according to which the latter are bound with the aid of heavy metallic salts ofthe xanthate,the metallic'salts forming themselves by chemical conversion during the drying process of the artificial cork composition at a temperature which lies below the decomposition temperature of the viscose itself. During the drying process of the artificial cork composition, 2'. c. of the mixture of cork Ohl s or waste, viscose, heavy metallic oxids, anc lndifi'crent substances, glycerin and mineral Oll, the single ingredients re-act'on each other and form in the first instance xanthate under the influence of the natural cork acids and if the latter do exist in small quantities only under the influence of other substances of acetous nature such as boric hydrate, and in the second instance the heavy metallic salts of the xanthate, which act then as bindmg medium. These heavy metallic salts are perfectly insoluble in water, alcohol, ether,

and the like. The volatile sulfur compounds WhlCh f0rm themselves by the re-action of cork acid on viscose, are instantly bound with metallic oxids, while tannins roduced are also transferred into the indisso uble metallic salts. The artificiallcork is hereby de rived .of any strange smell and taste, while a so its whiteness is greatly increased the latter being even greater than with the natural or any other artificial cork.

The follo Wingis an example how to put the method into practice :By weight, 100 parts of 4% viscose, 6 parts of zinc oxid, 15 parts of glycerin, and 100 parts of cork chips or waste are thoroughly mixed, this mixture being pressed in molds and left to itself during one or two days at room temperature, after which the moldings are taken out and dried at a gradually increased tem erature.

Of course, the quantities o the ingredients employed may vary to suit requirements according 'to the quality of cork chips or .e cork chips or waste.

destined for.

be necessary to add the acids or other substances of acid nature, for instance if the quantity of viscose is increased 0r other ingredients such as sawdust are added t o.the

more glycerin and mineral oil is required to replace the deficiency of cork-wax. 'Ac- :cording to circumstances, mixtures of different heavy metallic oxidsmay be. employed; or even mixtures of heavy metallic oxlds con taining volatile sulfur compounds with such metallic oxids which do not contain the latter and which serve only for hit'ation and formation of salt, such as aluminium.

' Having fully described my invention, what I claim and desire to secure by Letters Patcut is:

1. Method of manufacturing artificial cork from cork chips or waste, according to which the cork chips or waste are mixed with sodium xanthate, heavy metallic oxids, and

I indifferent substances, glycerin and mineral oil, and this mixture is pressedin moles and dried, for the purpose set forth.

2. Method of manufacturing artificial cork from cork chips or waste, according to which the cork chips or waste are mixed with sodium xanthate, heavy metallic oxide with an addition of acids, and indifferent substances, glycerin and mineral oil, and this mixture is pressed in molds and dried, for the purpose set forth.

3. Method of manufacturing artificial cork from cork chips or waste, according towhicl'l by weight 100 parts of 4% viscose, 6 parts of zinc oxid, 15 parts of glycerin, and 100 parts of cork chips or waste are thorou hly mixed,

temperature.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses,

' BRONISLAUS HONOWSKY.

Witnesses:

i .W. STADIKOW,

"S. MOUROMOFF.

To induce there-action it may sometimes and this'rnixture is pressed in r 0 ds and left' to itself during one or 1 two days at: room temperature, after which the moldings are taken out and dried at a gradually increased waste, and to the object the artificial cork is In the latter casejil'fsfin 

